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Pore water pressure increment model for saturated Nanjing fine sand subject to cyclic loading

ISSN号：1671-3664
期刊名称：《地震工程与工程振动：英文版》
时间：0
分类：TU473.13[建筑科学—结构工程;建筑科学—土工工程] TU441.4[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]Institute of Geotechnical Engineering, Nanjing University of Technology, Nanjing 210009, China
相关基金：Supported by： Key Research Project of National Natural Science Foundation of China Under Grant No. 90715018; National Basic Research Program of China Under Grant No.2007CB714200; and the Special Fund for the Commonweal Industry of China Under Grant No.200808022

作者： Wang Binghui Chen Guoxing Jin Dandan[1]

关键词：超孔隙水压力, 饱和砂土, 循环加载, 增量模型, 南京, 测试曲线, 罚款, 循环次数, cyclic loading, Nanjing fine sand, EPWP model, EPWP increment ratio, effective dynamic shear stress ratio, logarithmic decrement of effective stress

中文摘要：

三组动态 triaxial 测试为受到一致周期的装载的浸透的南京好沙被执行。过量毛孔的测试曲线与周期的数字的比率浇压力(EPWP ) 比率变化被提供。EPWP 增长比率的概念被介绍并且二个新概念有效动态砍压力比率和有效应力的木头减少被定义。EPWP 增长比率的发展能被划分成三个阶段，这被发现：下降，稳定、上升。在稳定、上升的阶段，而且，一种令人满意的线性关系在积聚的 EPWP 增长比率和自然对数之间被获得有效动态砍压力比率。因此，在周期 N 的数字的 EPWP 增长比率被推出了那与在周期数字 N-1 的有效应力的木头减少成正比，但是独立于周期的压力振幅。基于分析，为浸透的南京好沙的一个新 EPWP 增长模型从适合的测试数据被开发，它提供 EPWP 产生的曲线的更好的预言，周期的数字为起始的液化和液化抵抗要求了。

英文摘要：

Three groups of dynamic triaxial tests were performed for saturated Nanjing fine sand subjected to uniform cyclic loading. The tested curves of the excess pore water pressure （EPWP） ratio variation with the ratio of the number of cycles are provided. The concept of the EPWP increment ratio is introduced and two new concepts of the effective dynamic shear stress ratio and the log decrement of effective stress are defined. It is found that the development of the EPWP increment ratio can be divided into three stages： descending, stable and ascending. Furthermore, at the stable and ascending stages, a satisfactory linear relationship is obtained between the accumulative EPWP increment ratio and natural logarithm of the effective dynamic shear stress ratio. Accordingly, the EPWP increment ratio at the number of cycles N has been deduced that is proportional to the log decrement of effective stress at the cycle number N-l, but is independent of the cyclic stress amplitude. Based on the analysis, a new EPWP increment model for saturated Nanjing fine sand is developed from tested data fitting, which provides a better prediction of the curves of EPWP generation, the number of cycles required for initial liquefaction and the liquefaction resistance.

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